New toilets in Indian trains no better than septic tanks, reveals IIT study

Most of the new 'bio-toilets' on Indian trains are ineffective or ill-maintained and the water discharged no better than raw sewage

A new kind of toilet using bacteria to break down human excreta has been deployed in Indian trains over four years to 2017, at a cost of Rs 1,305 crore, but this toilet is no better than a septic tank, the Indian Institute of Technology, Madras, has concluded after a two-year long study.

As many as 93,537 “bio-digesters”–as the toilets are called–have been installed in mainline express and mail trains by the Indian Railways. These are small-scale sewage-treatment systems beneath the toilet seat: Bacteria in a compost chamber digest human excreta, leaving behind water and methane. Only